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At: list all append lemma 1 2 2
1. T: Type
2. P: TProp
3. L: T List
4. u: T
5. v: T List
6. M:T List. x(v @ M).P(x) xv.P(x) & xM.P(x)
7. M: T List
8. P(u)
9. x(v @ M).P(x)

xM.P(x)
By: Sel 2 (FwdThru 6 [-1])
Generated subgoal:

110. xM.P(x)
xM.P(x)

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listfunctionuniversepropimpliesandall

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